What do "tangled" and "twists" mean here?

The Tiflis bank robbery turned out to be far from perfect. Indeed it became a poisoned chalice. Afterwards, Stalin never lived in Tiflis or Georgia again. The fate of Kamo would be insanely bizarre. The quest for the cash—some of which, it turned out, was in marked notes—would be tangled, but even these astonishing twists were far from the end of the matter for Stalin.

Excerpt From: Simon Sebag Montefiore. “Young Stalin.” Knopf Doubleday Publishing Group, 2007. iBooks.

Hi. What do "tangled" and "twists" mean here?
Thank you.