I'd wager we are looking at
a rebus. Naturally. :-)
Start by unscrambling the image:
Assuming that all the circle segments in the corners and on the sides of the images combine to make single-coloured full circles, there's only one way to assemble the jigsaw puzzle into a 5x5 grid as required by the title:
Then, solve it row by row
Perpendicular - Pound - Empty set - Jewish (Hebrew) Plus - Dollar
Naira - Katakana Yo - Right Semijoin - Gimel - Pilcrow
Rho - Scruple - Tshe - Universal quantifier - Vertical Bar
Small Eth - Existential quantifier - Small Capital Lambda - Exclamation - Shang
Open O - Three - Up Tack - Schwa - Latin Alpha
This is very interesting:
These all are unicode characters of some kind. Particularly of the kind that look like upside-down letters. Write them down, stand on your head, and read.
Like so: (All polished up with a little help from OP's comments below)
⟂ £ ∅ ﬩ $
₦ ヨ ⋊ ℷ ¶
ρ ℈ ћ ∀ |
ð ∃ ᴧ ! 上
ɔ 3 ⊥ ə Ɑ
With a little squinting, it reads
"Detective played by Ken Stott", which finally brings us to the answer.
Appendix: Full reasoning for the individual images, in the unscrambled order:
er to peer, pen, dic k, Ural, swap r and l to get ular
a pound is equal to 453.6 grams.
A set with no elements is called an empty set
Star of David hints at Hebrew; it is the symbol for Judaism. The Hebrew language has an alternative symbol for plus.
Doll + upside-down (reversed) Egyptian god Ra = ar
Latter part of Rastafarian reversed = Naira, the Nigerian monetary unit.
Katana + "ka" in the middle = katakana, one of the Japanese writing systems. Half of Yo-yo is yo, a Japanese syllable.
Arrow pointing to the right, followed by New York Times, reversed, for semi, and join
An upside-down (reversed) lemming, with the letters N and M removed: g
Pill + Crow, slightly misspelled.
"ESC" minus E plus ruble with a letter exchanged: "ruple"
The Egyptian god Seth, with letters scrambled in the order given, to get "Tshe". (Surprisingly, didn't have anything to do with the numbers being an approximation for $1000 \times \pi$)
Universal serial bus, "quid pro quo" - d + ant in the middle = quanti, Semper fi, reconquista (A historical period on the Iberian peninsula) reversed for er
Quite simply vertically written word bar
S means small when written on a tee shirt, eth fits all the empty spaces, creating an English word each time.
exit + S = exist, vial with the letter swap = ential, quant
um mechanics, wifi, flag of Eritrea, country code er.
Ottawa is the (small) capital of Canada, lamb, Cyrillic word "da"
Ex libris, clam, AT&T, hydrogen ion
Picture of Shanghai, with the first character of the city's Chinese name hidden
o, pen, o
tree with an added h gives three
Arrow pointing up, t
Flag of Germany hints at language, the colour pointed at is black, which is Schwarz in German, picking the first 5 of the 7 letters gives Schwa.
(Original puzzle had an error, which is still visible in the unshuffled image; instead of "Si", it was supposed to read "Sn".) Map has Los Angeles highlighted for LA, Sn is the symbol for the element tin, and the letter is of course an alpha.